Sawmill.



c. L. GRAVES.

SAWMILL.

APPLICATION FILED OCT-11.1917.

Patentd Apr. 22,1919.

' CLARENCE L. GRAVES, OF ELAND, WISCONSIN.

SAWMILL.

Specification of Letters Patent.

Patented Apr. 22, 1919.

Application filed October 11, 1917. Serial No. 195,926.

To all whom it may concern:

Be it known that I, CLARENCE L. GRAVES, acitizen of the United States, and resident of Eland, in" the county of Shawano and 1 State of Wisconsin, have invented certain new and useful Improvements in Sawmills; and I do hereby declarethat the following is a full, clear, and" exact description thereof.

inyention relates to certain new and useful improvements in sawmills, andrefers more particularly to saw mills of that type embodying a pivoted, counterbalanced saw carrying boom.

In former devices of this character, a pulley is mounted at the pivot of the boom from which runs a belt to the saw pulley at the outer end of the boom, and from which also leads a second belt to the main drive pulley. Such a construction has been required in order to prevent tightening of the belt engaging the saw pulley and necessitates an expensive structure, which is very objectionable.

Hence, with these inherent objections in mind my invention was conceived and has for its primary object to provide a vertically swinging saw boom, the pivot of which is adjustable to axially aline with the main drive pulley and thus dispenses with the usual pulleys journaled at the pivot of the boom, whereby a simpler and more eflicient structure is produced.

A further object of the present invention is to provide a device of the class described capable of securement to the frame of a portable drive engine unit, whereby the drive belt for the saw may be coupled directly to the pulley of the engine.

With the above and other objects in view which will appear as the description proceeds, my invention resides in the novel construction, combination and arrangement of parts substantially as hereinafterdescribed and more particularly defined by the appended claim, it being understood that changes in the precise embodiment of the heroin disclosed invention may be made without departing from the spirit of the invention.

In the accompanying drawings, I have illustrated one complete example of the physical embodiment of my invention constructed according to the best mode I have so far devised for the practical application of the principles thereof, and in which:

Figure 1 is a side elevatiohal View there of, a portable drive engine unit being shown in conventional outline.

Fig. 2 is a top plan view thereof, and

Fig. 3 is a sectional view taken through the adjustable boom pivot on the line 3-3 of Fig. 1;

Referring now more particularly to the accompanying drawings, 1 designates a suitable internal combustion engine, or other source of power, mounted upon a truck com prising axles 2 and sustaining wheels 3, all of which may be of any well known construction.

My invention comprises a suitable longitudinal supporting base 4, which may be secured to the engine truck, as in this instance, by means of suitable U-bolts 5 engaging the axles 2, and fixed to the base 4, near the forward end thereof, is a pair of spaced up-standing guide standards 6 and secured to said base, near the other end thereof is an up-standing standard 7 The standard 7, as best shown in Fig. 1, is rigidly secured to the base 4 by means of any suitable fastenings 10 and is braced against lateral movement by angular bracket plates 13 engaging base 4 and the sides of said standard.

A saw boom 14 has its intermediate portion 11 guided between standards 6 and secured to the inner end thereof is a pair of rearwardly projecting plates 15 forming a bracket having its ends apertured to register with an aperture in a one piece clamp or binding collar 17 engaging standard 7, and a vertical slot 20 in the standard 7, and through said apertures and slot a pivot bolt 16 is passed to thus pivotally support the inner end of said boom 14. As best shown in Fig. 3, the clamp 17 is adapted to be retained at any desired position on standard 7 by means of a binding bolt 19 and it will be obvious that the pivot of boom 14 is adjusted by said clamp 17.

The outer end of boom 14 is provided with suitable bearings 21 in Which is journaled a transverse shaft 22 carrying at one end circular saw blades 23 and at its other end a pulley 24 which is adapted to be connected with a drive pulley 26 of the engine 1 by means of a suitable belt 27. As best shown in Fig. 1, the boom 14 is normally held from operative position by means of a lever 28, intermediately pivoted at 29 between the upper ends of standards 6 and having one and connected by means of 30 to boom l l and its other end Weighted as at 31, a suitable handle or other means 32 being provided at the extreme outer end of boom' 1% whereby Weight 31 is overcome and saw 23 moved downwardly as depicted by dotted lines in Fig. 1.

From the foregoing description taken in connection with the accompanying drawings, it will be obvious that in use, the supporting base i is mounted so that standard 7 is in vertical alinement With the drive pulley 26 of engine 1, and then pivot bolt 16 is adjusted to axially aline With pulley 26 by means of clamping collar 17, when belt I 27 is then connected with pulley 24 and the driving pulley 26. e

As Will be apparent to those skilled in the art to Which an invention of this character appertains the additional pulleys formerly journaled at pivot 16 have been dispensed 3 with and that boom 14: may be readily moved Vertically Without tightening belt 27.

I claim:

In a device of the class described, a longitudinally slotted beam, a clamping collar adjustably mountedupon said beam, a pivot bolt journaled in said collar and passed through the slot of the beam, and a boom mounted on the pivot bolt. 1

In testimony that I claim the foregoing I have hereunto set my hand at Eland, in

the county of Shawano, and State of Wisconsin. V CLARENCE L.' GRAVES.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner offateuta Washington, D; G." 1 

